FAQs for Engineers, Surveyors & Architects

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Floodplain Management

Expand/Contract Questions and Answers

  • How long does it take to obtain a Letter of Map Amendment (LOMA) or a Letter of Map Revision Based on Fill (LOMR-F)?

  • Which elevation datum should I use?

  • What is the Base Flood Elevation?

  • What is the base, or 1-percent-annual-chance, flood?

  • What are the different flood insurance risk zone designations and what do they mean?

  • What are the different types of Letters of Map Change (LOMCs)?

  • I plan to request a map update or revision. What are my options and where can I obtain more information?

  • How do I find out when a Flood Insurance Rate Map (FIRM) was last updated?

  • Why are temporary benchmarks included on some Flood Insurance Rate Maps (FIRMs) and not on others?

  • Where can I view or obtain a copy of a Flood Insurance Rate Map (FIRM) or Flood Insurance Study (FIS) report?

  • How do I determine whether a hydrologic and hydraulic model is accepted for use by the National Flood Insurance Program (NFIP)?

  • Who can prepare an Elevation Certificate?

  • When should a Conditional Map Revision be requested?

  • When should I request a revision to a Flood Insurance Rate Map (FIRM)?

  • What are the FEMA requirements for removing a structure from the Special Flood Hazard Area (SFHA)?

  • Where can I obtain the backup or supporting data for a Flood Insurance Study (FIS)?

  • How do I determine a Base Flood Elevation (BFE) for an approximate Zone A area?